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Chromebooks, probably. The 12" Retina MacBook that preceded the MacBook Air refresh and then the M1 MacBook Air generation, yes. Newer MacBook Airs, nope. As for Windows devices, there are too many to list but your big players like the XPS 13 I believe no. Just google the model you want with like charging requirements and you should be able to get a more specific answer. Generally speaking, I would not want 30 w to charge any laptop unless it's perhaps a Chromebook.
45 watts would kind of be my minimum point mainly for faster charging. Also some of the laptops that can be charged by 30 w will probably drain, albeit a bit slower, while being charged.
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(to serve the function of a mini "UPS")
And will its battery life be reduced if it's kept plugged-in always?
Very slow to recharge when laptop is not in use.